Evaluate the polynomial two ways:by substituting in the given value of x, and by using synthetic division: Find P(-4) for P(x)=x^4+2x^3-13x^2-39

Question

dumbcow · Answer

P(-4) = (-4)^4 +2*(-4)^3 -13*(-4)^2 -39
=256-128-208-39
=-119

synthetic division:
-4 | 1       2      -13        0      -39
               -4        8         20      -80
      -------------------------
       1       -2      -5       20     -119

anonymous · Answer

Thanks so much.

dumbcow · Answer

your welcome

anonymous · Answer

Do you have any idea of how to work this one? approximate to two decimal places, find the x-intercepts, local maximum and local minimum: p(x)=x^3+2x^2-7x-5

dumbcow · Answer

it doesnt factor so you need to graph the function or plot points to identify those points